Dr. Robert Cohen is Professor of Medicine and Director of Occupational Lung Disease.Dr. Cohen has practiced clinical pulmonary medicine for more than 30 years and is board certified in Internal Medicine, Pulmonary Medicine, Critical Care Medicine, and has been a Certified NIOSH B-Reader since 1998. Dr. Cohen has a broad background in public health, occupational lung disease and has been an investigator in the area of respiratory disease in populations of occupationally exposed workers.